LONDON — How powerful is the U.S. president? Enough to take the weightiest job imaginable and make it pretty entertaining. Take a couple of weeks recently out of Donald Trump’s life. He slept Wednesday night in a castle fit quite literally for a king, the guest of a British leadership eager to impress a president who likes to be honored. He left Thursday for a White House that he’s remaking to suit his tastes. Workers have been digging up trees to accommodate his passion projec

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